Transmission line

Abstract

A transmission line matable to a differential signal source, includes a first connector having a impedor and a first differential terminal pair, a second connector having a conversion module and a second differential terminal pair, and a wire electrically connected to the first and the second connectors. A differential signal received by the first differential terminal pair of the first connector at one end of the transmission line is processed by the impedor and then is converted into a single-ended signal transmitted on the wire. Then the conversion module restores the single-ended signal to the differential signal, and the differential signal is output from the second differential terminal pair of the second connector at the other end of the transmission line.

What is claimed is: 
     
         1 . A transmission line matable to a differential signal source, comprising:
 a first connector, having a first impedor and a first differential terminal pair fixed to the first connector;   a second connector, having a first conversion module and a second differential terminal pair fixed to the second connector; and   a first wire, having two ends electrically connected to the first connector and the second connector respectively,   wherein when the first differential terminal pair receives a differential signal and is conductively connected to two circuits having equal impedance, a terminal of one of the circuits is connected to the first impedor and a terminal of the other of the circuits is electrically to the first wire to transmit a single-ended signal to the first conversion module, the first conversion module restores the single-ended signal to the differential signal and outputs the differential signal to the second differential terminal pair, and one differential terminal of the first differential terminal pair and an electronic circuit for transmitting the single-ended signal have equal high-frequency impedance.   
     
     
         2 . The transmission line according to  claim 1 , wherein the first impedor is a terminal resistor and is grounded. 
     
     
         3 . The transmission line according to  claim 1 , wherein the electronic circuit for transmitting the single-ended signal is only the first wire. 
     
     
         4 . The transmission line according to  claim 1 , wherein the first differential terminal pair and the first wire are conductively connected to a first circuit board, the electronic circuit for transmitting the single-ended signal comprises circuits on the first circuit board and the first wire, and one differential terminal of the first differential terminal pair, the circuits on the first circuit board and the first wire have equal high-frequency impedance. 
     
     
         5 . The transmission line according to  claim 1 , wherein the first conversion module has an identification element, and the single-ended signal is restored to the differential signal after being identified by the identification element and processed by the first conversion module. 
     
     
         6 . The transmission line according to  claim 1 , wherein the first wire is a coaxial wire. 
     
     
         7 . The transmission line according to  claim 6 , wherein the first connector has a first circuit board, the second connector has a second circuit board, and shielding layers at two ends of the first wire are conductively connected to a shielding pad of the first circuit board and a shielding pad of the second circuit board respectively. 
     
     
         8 . The transmission line according to  claim 1 , wherein the first conversion module has an amplification element, and the differential signal received by the first differential terminal pair is amplified by the amplification element and then is conductively connected to the two circuits. 
     
     
         9 . The transmission line according to  claim 1 ,
 wherein the first connector further comprises a third differential terminal pair and a second conversion module;   wherein the second connector further comprises a fourth differential terminal pair and a second impedor;   wherein the transmission line further comprises a second wire; and   wherein a differential signal received by the fourth differential terminal pair is transmitted from the second connector to the first connector and the third differential terminal pair outputs the differential signal, a transmission mode from the second connector to the first connector is the same as a transmission mode from the first connector to the second connector.   
     
     
         10 . A transmission line matable to a differential signal source, comprising:
 a first connector, having a first impedor and a first conversion module, wherein two first differential terminal pairs are fixed to the first connector;   a second connector, having a second impedor and a second conversion module, wherein two second differential terminal pairs are fixed to the second connector; and   a first wire and a second wire, each having two ends electrically connected to the first connector and the second connector respectively,   wherein in a first direction, one of the first differential terminal pairs receives a differential signal and is conductively connected to two first circuits having equal impedance, a terminal of one of the first circuits is connected to the first impedor, a terminal of the other of the first circuits is electrically connected to the first wire to transmit a single-ended signal to the second conversion module, one differential terminal of the first differential terminal pair and a first electronic circuit for transmitting the single-ended signal have equal high-frequency impedance, and the second conversion module restores the single-ended signal to the differential signal and outputs the differential signal to one of the second differential terminal pairs; and   wherein in a second direction, the other of the second differential terminal pairs receives a differential signal and is conductively connected to two second circuits having equal impedance, a terminal of one of the second circuits is connected to the second impedor, a terminal of the other of the second circuits is electrically connected to the second wire to transmit a single-ended signal to the first conversion module, the first conversion module restores the single-ended signal to the differential signal and outputs the differential signal to the other of the first differential terminal pairs, and one differential terminal of the second differential terminal pair and a second electronic circuit for transmitting the single-ended signal have equal high-frequency impedance.   
     
     
         11 . The transmission line according to  claim 10 , wherein the first impedor and the second impedor are both terminal resistors and are grounded. 
     
     
         12 . The transmission line according to  claim 10 , wherein the first electronic circuit is only the first wire and the second electronic circuit is only the second wire. 
     
     
         13 . The transmission line according to  claim 10 , wherein the first differential terminal pair and the first wire are conductively connected to a first circuit board, the second differential terminal pair and the second wire are conductively connected to a second circuit board, the first electronic circuit comprises circuits on the first circuit board and the first wire, the first differential terminal, the circuits on the first circuit board and the first wire have equal high-frequency impedance, the second electronic circuit comprises circuits on the second circuit board and the second wire, and one differential terminal of the second differential terminal pair, the circuits on the second circuit board and the second wire have equal high-frequency impedance. 
     
     
         14 . The transmission line according to  claim 10 , wherein the first conversion module and the second conversion module each have an identification element, and single-ended signals in two directions are restored to differential signals after being identified by corresponding identification elements and processed by the first conversion module and the second conversion module. 
     
     
         15 . The transmission line according to  claim 10 , wherein the first wire and the second wire are both coaxial wires. 
     
     
         16 . The transmission line according to  claim 10 , further comprising a cable, wherein the cable comprises the first wire and the second wire, and an outer rubber sheath, an inner rubber sheath, and a weave layer located between the outer rubber sheath and the inner rubber sheath and used for shielding are disposed outside the cable. 
     
     
         17 . The transmission line according to  claim 16 , wherein the cable has the two first wires, the two second wires, two power supply lines, two ground lines, and two low-frequency lines, and four first differential terminal pairs and four second differential terminal pairs are disposed correspondingly. 
     
     
         18 . The transmission line according to  claim 17 , wherein the two first wires, the two second wires, and the two power supply lines are distributed along an inner surface of the inner rubber sheath, the two ground lines, the two low-frequency lines and at least one of nylon threads and fiber threads are distributed in a space defined by the inner surface of the inner rubber sheath. 
     
     
         19 . The transmission line according to  claim 17 , wherein the first connector has a first circuit board, the second connector has a second circuit board, and the two first wires and the two second wires are conductively connected to the first circuit board at one surface of the first circuit board and are conductively connected to the second circuit board at one surface of the second circuit board. 
     
     
         20 . The transmission line according to  claim 19 , wherein two ends of the cable are each disposed with a retaining rack, and the retaining rack fixes the two first wires, the two second wires, the two power supply lines, the two ground lines, and the two low-frequency lines and enables the two first wires, the two second wires, the two power supply lines, the two ground lines, and the two low-frequency lines to correspond to pads on the first circuit board and the second circuit board. 
     
     
         21 . The transmission line according to  claim 10 , wherein the first conversion module and the second conversion module each have an amplification element, and differential signals received by the first differential terminal pair and the second differential terminal pair are amplified by the amplification elements.